Thanks for the comments, Hasa. Feel free to comment on future (and past) posts. As for calling Mel Gibson, the director, I don't think that totally works as I wanted to refer to all his hat wearing (and being the co-writer specifically).

Hasa said everything I would have said, and I probably wouldn't have picked up in that 監督 thing, but he's right. It's not so much listing what job he did as a kind of honorific. It's just what you say when you're talking about a film director (and possibly co-writer and everything else).